/Engine/Source/Runtime/Engine/Classes/GameFramework/CharacterMovementComponent.h
Event triggered when we are moving on a base but we are not able to move the full DeltaPosition because something has blocked us. Note: MoveComponentFlags includes the flag to ignore the movement base while this event is fired.
virtual void OnUnableToFollowBaseMove ( const FVector & DeltaPosition, const FVector & OldLocation, const [FHitResult](API\Runtime\Engine\Engine\FHitResult) & MoveOnBaseHit )